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I'm running a pair of 2020i's at the moment and they are very impressive. I think Wharfedale came with some that were supposed to be a tiny bit better. A lot of it depends on the space you have and budget but I'd save for a pair with integrated amps if you are worried about amp matching.
The biggest problem I've had matching amps was putting an amp with too little power together with larger speakers, it can affect the bass as that's where the biggest current draw is. Your amp should have 40% or more power available than your speakers rms max. It's counterintuitive but you need more power for the very short peaks in the music program otherwise you'll be creating distortion in the amp which can damage the speakers. At 25w per channel you are inviting that sort of problem.
In terms of the sound quality of an amp it's usually the pre amp stage that does most damage, all the pots and switches, Cambridge audio are not too bad but you'll not want to compare it to the 'straight wire' approach of a boutique pre amp mono blocks. One possibility could be a second hand Sonos connect:amp. 150w per channel will drive a lot of speakers, if you get a chance you should try a different amp with your current speakers to see if you hear any difference.
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Airhead
@Lw.
Lower end hi-fi question; my current set up is project debut carbon or chrome cast audio (vinyl or streaming) > Cambridge audio topaz am5 amp > wharfdale diamond 9 speakers which sounds nice & I've been happy with over the years but I feel like it could be better in some circumstances - would upgrading the speakers to something like Dali spektor 2's or Q acoustics 3020i's deliver a decent improvement or would they be being held back by the budget nature of the amp (I won't be changing the record player)?